Laura Prepon -- Good Genes or Good Docs?

Laura Prepon's good looks deserve a show of their own!

Here's a 19-year-old version of the "That 70's Show" star showing off her bright hair at an event in New York City (left) and 19 years later ... the now 38-year-old "Orange Is the New Black" babe going goth in New York just last month (right).

The question is ...